Dual bottle unit



FIG. 1 is a perspective view of a dual bottle unit showing my new design;

FIG. 2 is a front elevation thereof, the rear elevation is the same;

FIG. 3 is a side elevation thereof, the opposite side is the same;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a dual bottle unit, as shown and described. 